Table 3 Quality assurance/quality control information for Al, Cd, Cu, Pb, and Zn determinations for one standard reference material (USGS 2711a)
From: Low presence of potentially toxic elements in Singapore urban garden soils
| Â | Cd | Cu | Pb | Zn |
|---|---|---|---|---|
Certified value (mg/kg) | 54.1 ± 0.5 | 140 ± 2 | 1400 ± 10 | 414 ± 11 |
Analyzed value (mg/kg) | 58.6 ± 0.8 | 190.6 ± 8.6 | 1462 ± 13 | 418.4 ± 4.7 |
Recovery (%) | 108 | 136 | 104 | 101 |
Bias (%) | 8.3 | 36.1 | 4.4 | 1.1 |
Precision | 0.01 | 0.05 | 0.01 | 0.01 |